Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Net income attributable to Graham Holdings Company common stockholders	$ 124,380	$ 52,272
Less: Dividends paid-common stock outstanding and unvested restricted shares	(15,352)	(15,812)
Undistributed earnings	$ 109,028	$ 36,460
Percent allocated to common stockholders (1)	99.33%	99.35%
Undistributed Earnings Allocated To Common Stockholders	$ 108,295	$ 36,225
Add: Dividends paid-common stock outstanding	15,250	15,711
Numerator for basic earnings per share	123,545	51,936
Add: Additional undistributed earnings due to dilutive stock options	4	1
Numerator for diluted earnings per share	$ 123,549	$ 51,937
Weighted average shares outstanding (shares)	4,432	4,759
Denominator for diluted earnings per share (shares)	4,457	4,776
Graham Holdings Company Common Stockholders:
Basic income per common share (in usd per share)	$ 27.87	$ 10.91
Diluted income per common share (in usd per share)	$ 27.72	$ 10.88
Stock Option Plan [Member]
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items]
Add: Effect of dilutive stock options (shares)	25	17